feat(cache): Move cache files to cache directory

This commit moves the `apps_cache.json` and `contacts_cache.json` files from the `filesDir` to the `cacheDir`.

A migration step has been added to delete the old cache files from the previous location upon application startup.

Author: CreativeCodeCat

app/src/main/java/com/github/droidworksstudio/mlauncher/MainActivity.kt

@@ -520,6 +520,7 @@ class MainActivity : AppCompatActivity() {
     private fun migration() {
         migration.migratePreferencesOnVersionUpdate(prefs)
         migration.migrateMessages(prefs)
+        migration.deleteOldCacheFiles(applicationContext)
     }
 
 }

app/src/main/java/com/github/droidworksstudio/mlauncher/MainViewModel.kt

@@ -62,8 +62,8 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
     private val prefs = Prefs(appContext)
 
     // Cache files
-    private val appsCacheFile = File(appContext.filesDir, "apps_cache.json")
-    private val contactsCacheFile = File(appContext.filesDir, "contacts_cache.json")
+    private val appsCacheFile = File(appContext.cacheDir, "apps_cache.json")
+    private val contactsCacheFile = File(appContext.cacheDir, "contacts_cache.json")
 
     // in-memory caches for instant load
     private var appsMemoryCache: MutableList<AppListItem>? = null

app/src/main/java/com/github/droidworksstudio/mlauncher/data/Migration.kt

@@ -3,6 +3,7 @@ package com.github.droidworksstudio.mlauncher.data
 import android.content.Context
 import com.github.droidworksstudio.common.AppLogger
 import com.github.droidworksstudio.mlauncher.BuildConfig
+import java.io.File
 
 class Migration(val context: Context) {
     fun migratePreferencesOnVersionUpdate(prefs: Prefs) {
@@ -90,4 +91,21 @@ class Migration(val context: Context) {
             }
         }
     }
+
+    fun deleteOldCacheFiles(appContext: Context) {
+        // References to the old files in filesDir
+        val oldAppsCacheFile = File(appContext.filesDir, "apps_cache.json")
+        val oldContactsCacheFile = File(appContext.filesDir, "contacts_cache.json")
+
+        // Delete them if they exist
+        if (oldAppsCacheFile.exists()) {
+            oldAppsCacheFile.delete()
+            AppLogger.d("CacheCleanup", "apps_cache.json deleted")
+        }
+
+        if (oldContactsCacheFile.exists()) {
+            oldContactsCacheFile.delete()
+            AppLogger.d("CacheCleanup", "contacts_cache.json deleted")
+        }
+    }
 }